Flow report
Maryland streamflow
Live discharge, gauge height, water temperature, and percent-of-normal readings from every USGS streamgauge in Maryland. Built for paddlers, anglers, water managers, and flood researchers.
USGS gauges
100
State percent normal
21%
Paddle runs
0
Updated
May 30
Open the Maryland flow layer on the map
Every USGS streamgauge filtered to Maryland.
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May
30
2026
Flow briefing
Streamflow levels across Maryland are currently 21% of normal, with the Susquehanna River At Conowingo reporting the highest discharge in the state at 9,240 cfs and a gauge stage of 10.20 ft.
Meanwhile, the Monocacy River At Monocacy Blvd At Frederick is seeing a spike today — up 432% since yesterday and currently running near peak.
Tap any gauge below for the full hydrograph, paired weather forecast, and historical context. Use the rivers panel to jump into Maryland's named rivers.
Maryland at a glance
State-wide streamflow overview
The Maryland flow picture in four data points -- where the state sits versus historical norms, what's flowing hardest, and what's spiking fastest.
Percent of normal
21%
100% is the historical norm. Below 70% indicates drought; above 130% can flag elevated flood risk.
Highest discharge
Susquehanna River At Conowingo
9,240 cfs
Gauge stage 10.20 ft
Biggest 24h spike
Monocacy River At Monocacy Blvd At Frederick
+432%
Now 803 cfs
Network coverage
Gauges + rivers tracked
100 + 13
USGS gauges feeding 13 named rivers in Maryland.
Full streamgauge inventory
Maryland USGS streamgauges
Every USGS gauge Snoflo tracks in Maryland. Sortable, quickly filterable. Numeric columns heat-mapped from light to deep. Tap any gauge for its full hydrograph and forecast.
| Streamgage | Streamflow | Gage height | Water temp | Air temp | Elevation | Watershed |
|---|---|---|---|---|---|---|
|
Deer Creek Near Darlington, Md
7 days ago · USGS 01580520 |
263 cfs | 2.10 ft | · | 63°F | 49 ft | Lower Susquehanna |
|
Deer Creek At Rocks, Md
7 days ago · USGS 01580000 |
132 cfs | 2.48 ft | · | 62°F | 262 ft | Lower Susquehanna |
|
Susquehanna River At Conowingo, Md
7 days ago · USGS 01578310 |
9,240 cfs | 10.20 ft | · | 63°F | 21 ft | Lower Susquehanna |
|
Sallie Harris Creek Near Carmichael, Md
7 days ago · USGS 01492500 |
3 cfs | · | · | 63°F | 14 ft | Chester-Sassafras |
|
Unicorn Branch Near Millington, Md
7 days ago · USGS 01493000 |
11 cfs | 1.41 ft | · | 62°F | 8 ft | Chester-Sassafras |
|
Chesterville Branch Near Crumpton, Md
8 months ago · USGS 01493112 |
1 cfs | 2.64 ft | 51°F | 62°F | 10 ft | Chester-Sassafras |
|
Morgan Creek Near Kennedyville, Md
7 days ago · USGS 01493500 |
4 cfs | 1.27 ft | · | 62°F | 4 ft | Chester-Sassafras |
|
Big Elk Creek At Elk Mills, Md
7 days ago · USGS 01495000 |
73 cfs | 3.57 ft | · | 63°F | 70 ft | Chester-Sassafras |
|
Sawmill Creek At Glen Burnie, Md
7 days ago · USGS 01589500 |
4 cfs | 1.93 ft | · | 64°F | 34 ft | Gunpowder-Patapsco |
|
East Branch Herbert Run At Arbutus, Md
7 days ago · USGS 01589100 |
3 cfs | 1.01 ft | · | 63°F | 49 ft | Gunpowder-Patapsco |
|
Gwynns Falls At Washington Blvd At Baltimore, Md
7 days ago · USGS 01589352 |
82 cfs | 2.86 ft | · | 64°F | 18 ft | Gunpowder-Patapsco |
|
Patapsco River At Hollofield, Md
7 days ago · USGS 01589000 |
78 cfs | 1.62 ft | · | 61°F | 190 ft | Gunpowder-Patapsco |
|
Dead Run At Franklintown, Md
7 days ago · USGS 01589330 |
10 cfs | · | · | 61°F | 313 ft | Gunpowder-Patapsco |
|
Moores Run At Radecke Ave At Baltimore, Md
3 years ago · USGS 01585230 |
0 cfs | 1.56 ft | 55°F | 63°F | 43 ft | Gunpowder-Patapsco |
|
Gwynns Falls At Villa Nova, Md
7 days ago · USGS 01589300 |
34 cfs | 1.10 ft | · | 61°F | 367 ft | Gunpowder-Patapsco |
|
Whitemarsh Run At White Marsh, Md
7 days ago · USGS 01585100 |
9 cfs | 3.56 ft | · | 64°F | 42 ft | Gunpowder-Patapsco |
|
West Branch Herring Run At Idlewylde, Md
7 days ago · USGS 01585200 |
3 cfs | 1.31 ft | · | 61°F | 286 ft | Gunpowder-Patapsco |
|
Whitemarsh Run Near Fullerton, Md
7 days ago · USGS 01585090 |
4 cfs | 1.35 ft | · | 63°F | 138 ft | Gunpowder-Patapsco |
|
Honeygo Run Near White Marsh, Md
7 days ago · USGS 01585104 |
1 cfs | · | · | 63°F | 25 ft | Gunpowder-Patapsco |
|
Jones Falls At Sorrento, Md
7 days ago · USGS 01589440 |
15 cfs | 7.87 ft | · | 62°F | 236 ft | Gunpowder-Patapsco |
|
Minebank Run Near Glen Arm, Md
7 days ago · USGS 0158397967 |
2 cfs | 4.24 ft | · | 61°F | 225 ft | Gunpowder-Patapsco |
|
Otter Point Creek Near Edgewood, Md
5 years ago · USGS 01581757 |
57 cfs | 1.26 ft | · | 31°F | 6 ft | Gunpowder-Patapsco |
|
Gwynns Falls Near Delight, Md
7 days ago · USGS 01589197 |
5 cfs | · | · | 61°F | 536 ft | Gunpowder-Patapsco |
|
Morgan Run Near Louisville, Md
7 days ago · USGS 01586610 |
23 cfs | 1.63 ft | · | 60°F | 430 ft | Gunpowder-Patapsco |
|
Long Green Creek At Glen Arm, Md
7 days ago · USGS 01584050 |
5 cfs | 1.07 ft | · | 61°F | 290 ft | Gunpowder-Patapsco |
|
Gwynns Falls At Glyndon, Md
7 years ago · USGS 01589180 |
0 cfs | 0.98 ft | · | 34°F | 643 ft | Gunpowder-Patapsco |
|
Baisman Run At Broadmoor, Md
7 days ago · USGS 01583580 |
1 cfs | 1.19 ft | · | 61°F | 333 ft | Gunpowder-Patapsco |
|
Beaverdam Run At Cockeysville, Md
7 days ago · USGS 01583600 |
31 cfs | 2.89 ft | · | 62°F | 245 ft | Gunpowder-Patapsco |
|
Beaver Run Near Finksburg, Md
7 days ago · USGS 01586210 |
13 cfs | · | · | 61°F | 431 ft | Gunpowder-Patapsco |
|
Plumtree Run Near Bel Air, Md
7 days ago · USGS 01581752 |
2 cfs | 1.18 ft | 61°F | 62°F | 187 ft | Gunpowder-Patapsco |
|
North Branch Patapsco River At Cedarhurst, Md
7 days ago · USGS 01586000 |
74 cfs | 1.69 ft | · | 61°F | 423 ft | Gunpowder-Patapsco |
|
Little Gunpowder Falls At Laurel Brook, Md
7 days ago · USGS 01584500 |
26 cfs | 1.25 ft | · | 61°F | 260 ft | Gunpowder-Patapsco |
|
Western Run At Western Run, Md
7 days ago · USGS 01583500 |
59 cfs | 1.29 ft | · | 62°F | 265 ft | Gunpowder-Patapsco |
|
Winters Run Near Benson, Md
7 days ago · USGS 01581700 |
27 cfs | 1.43 ft | · | 62°F | 190 ft | Gunpowder-Patapsco |
|
Piney Run At Dover, Md
7 days ago · USGS 01583100 |
12 cfs | 1.67 ft | · | 61°F | 380 ft | Gunpowder-Patapsco |
|
Bynum Run At Bel Air, Md
7 days ago · USGS 01581500 |
8 cfs | · | · | 62°F | 260 ft | Gunpowder-Patapsco |
|
Gunpowder Falls At Glencoe, Md
7 days ago · USGS 01582500 |
124 cfs | 1.23 ft | · | 62°F | 247 ft | Gunpowder-Patapsco |
|
Cranberry Branch Near Westminster, Md
7 days ago · USGS 01585500 |
1 cfs | 1.29 ft | · | 61°F | 672 ft | Gunpowder-Patapsco |
|
Little Falls At Blue Mount, Md
7 days ago · USGS 01582000 |
62 cfs | · | · | 61°F | 306 ft | Gunpowder-Patapsco |
|
Gunpowder Falls Near Parkton, Md
7 days ago · USGS 01581920 |
28 cfs | 1.45 ft | 47°F | 61°F | 352 ft | Gunpowder-Patapsco |
|
Georges Run Near Beckleysville, Md
7 days ago · USGS 01581870 |
19 cfs | · | · | 61°F | 521 ft | Gunpowder-Patapsco |
|
Grave Run Near Beckleysville, Md
7 days ago · USGS 01581830 |
8 cfs | · | · | 61°F | 560 ft | Gunpowder-Patapsco |
|
Beetree Run At Bentley Springs, Md
7 days ago · USGS 01581960 |
11 cfs | · | · | 61°F | 491 ft | Gunpowder-Patapsco |
|
Gunpowder Falls At Hoffmanville, Md
7 days ago · USGS 01581810 |
24 cfs | 1.36 ft | · | 61°F | 550 ft | Gunpowder-Patapsco |
|
South Fork Jabez Branch At Millersville, Md
7 days ago · USGS 01589795 |
0 cfs | 3.20 ft | · | 63°F | 60 ft | Severn |
|
Tuckahoe Creek Near Ruthsburg, Md
7 days ago · USGS 01491500 |
20 cfs | · | · | 62°F | 14 ft | Choptank |
|
Choptank River Near Greensboro, Md
7 days ago · USGS 01491000 |
26 cfs | 2.52 ft | 69°F | 61°F | 5 ft | Choptank |
|
Western Branch At Upper Marlboro, Md
7 days ago · USGS 01594526 |
32 cfs | 1.98 ft | · | 61°F | 9 ft | Patuxent |
|
Patuxent River Near Bowie, Md
7 days ago · USGS 01594440 |
231 cfs | 5.01 ft | · | 62°F | 20 ft | Patuxent |
|
Patuxent Riv Near Laurel, Md
7 days ago · USGS 01592500 |
19 cfs | 4.32 ft | · | 61°F | 160 ft | Patuxent |
|
Little Patuxent River At Savage, Md
7 days ago · USGS 01594000 |
62 cfs | 3.32 ft | · | 62°F | 126 ft | Patuxent |
|
Little Patuxent River At Guilford, Md
7 days ago · USGS 01593500 |
34 cfs | 2.32 ft | · | 61°F | 267 ft | Patuxent |
|
Hawlings River Near Sandy Spring, Md
7 days ago · USGS 01591700 |
11 cfs | · | · | 61°F | 307 ft | Patuxent |
|
Patuxent River Below Brighton Dam Near Brighton, Md
7 days ago · USGS 01591610 |
13 cfs | 1.27 ft | 70°F | 60°F | 310 ft | Patuxent |
|
Patuxent River Near Unity, Md
7 days ago · USGS 01591000 |
18 cfs | 2.10 ft | · | 61°F | 383 ft | Patuxent |
|
Cattail Creek Near Glenwood, Md
7 days ago · USGS 01591400 |
12 cfs | · | · | 61°F | 382 ft | Patuxent |
|
Beaverdam Creek Near Salisbury, Md
8 years ago · USGS 01486500 |
17 cfs | 1.14 ft | · | 74°F | 7 ft | Blackwater-Wicomico |
|
Chicamacomico River Near Salem, Md
7 days ago · USGS 01490000 |
5 cfs | · | · | 60°F | 2 ft | Blackwater-Wicomico |
|
Manokin Branch Near Princess Anne, Md
7 days ago · USGS 01486000 |
1 cfs | 1.49 ft | · | 60°F | 14 ft | Pocomoke |
|
Nassawango Creek Near Snow Hill, Md
7 days ago · USGS 01485500 |
3 cfs | 1.39 ft | · | 59°F | 21 ft | Pocomoke |
|
Pocomoke River Near Willards, Md
7 days ago · USGS 01485000 |
9 cfs | 4.62 ft | · | 59°F | 22 ft | Pocomoke |
|
Birch Branch At Showell, Md
7 days ago · USGS 0148471320 |
1 cfs | 3.27 ft | · | 59°F | 6 ft | Chincoteague |
|
Mcmillan F Near Fort Pendleton, Md
5 years ago · USGS 01594950 |
2 cfs | · | · | 79°F | 2,453 ft | North Branch Potomac |
|
North Branch Potomac River At Steyer, Md
7 days ago · USGS 01595000 |
109 cfs | 2.59 ft | · | 54°F | 2,276 ft | North Branch Potomac |
|
North Branch Potomac River At Kitzmiller, Md
7 days ago · USGS 01595500 |
264 cfs | 2.85 ft | · | 57°F | 1,575 ft | North Branch Potomac |
|
Georges Creek At Franklin, Md
7 days ago · USGS 01599000 |
51 cfs | 2.42 ft | · | 59°F | 975 ft | North Branch Potomac |
|
Crabtree Creek Near Swanton, Md
9 years ago · USGS 01597000 |
154 cfs | 1.96 ft | · | 52°F | 1,626 ft | North Branch Potomac |
|
Savage Riv Bl Savage Riv Dam Near Bloomington, Md
7 days ago · USGS 01597500 |
58 cfs | · | 49°F | 56°F | 1,382 ft | North Branch Potomac |
|
Savage River Near Barton, Md
7 days ago · USGS 01596500 |
31 cfs | 1.28 ft | 56°F | 57°F | 1,659 ft | North Branch Potomac |
|
North Branch Potomac River Near Cumberland, Md
7 days ago · USGS 01603000 |
531 cfs | 2.72 ft | · | 58°F | 589 ft | North Branch Potomac |
|
Wills Creek Near Cumberland, Md
7 days ago · USGS 01601500 |
132 cfs | 2.49 ft | · | 56°F | 703 ft | North Branch Potomac |
|
Potomac River At Paw Paw, Md
7 days ago · USGS 01610000 |
1,250 cfs | 4.70 ft | · | 59°F | 501 ft | Cacapon-Town |
|
Town Creek Near Oldtown, Md
7 days ago · USGS 01609000 |
141 cfs | 2.94 ft | · | 59°F | 567 ft | Cacapon-Town |
|
Sideling Hill Creek Near Bellegrove, Md
7 days ago · USGS 01610155 |
147 cfs | 1.71 ft | · | 59°F | 482 ft | Cacapon-Town |
|
Antietam Creek Near Sharpsburg, Md
7 days ago · USGS 01619500 |
237 cfs | 2.82 ft | · | 61°F | 367 ft | Conococheague-Opequon |
|
Marsh Run At Grimes, Md
7 days ago · USGS 01617800 |
15 cfs | 1.26 ft | · | 61°F | 405 ft | Conococheague-Opequon |
|
Potomac River At Hancock, Md
7 days ago · USGS 01613000 |
1,200 cfs | 3.48 ft | · | 60°F | 396 ft | Conococheague-Opequon |
|
Conococheague Creek At Fairview, Md
7 days ago · USGS 01614500 |
240 cfs | 1.95 ft | · | 61°F | 438 ft | Conococheague-Opequon |
|
Antietam Creek Near Waynesboro, Md
7 days ago · USGS 01619000 |
91 cfs | 2.58 ft | · | 61°F | 547 ft | Conococheague-Opequon |
|
Potomac River Near Wash, Md
7 days ago · USGS 01646500 |
2,850 cfs | 3.00 ft | 45°F | 62°F | 43 ft | Middle Potomac-Catoctin |
|
Seneca Creek At Dawsonville, Md
7 days ago · USGS 01645000 |
62 cfs | 2.07 ft | · | 61°F | 216 ft | Middle Potomac-Catoctin |
|
Potomac River At Point Of Rocks, Md
7 days ago · USGS 01638500 |
3,030 cfs | 1.51 ft | 65°F | 61°F | 192 ft | Middle Potomac-Catoctin |
|
Catoctin Creek Near Middletown, Md
7 days ago · USGS 01637500 |
134 cfs | 2.30 ft | · | 60°F | 436 ft | Middle Potomac-Catoctin |
|
Bennett Creek At Park Mills, Md
7 days ago · USGS 01643500 |
28 cfs | 1.63 ft | · | 61°F | 304 ft | Monocacy |
|
Monocacy River At Jug Bridge Near Frederick, Md
7 days ago · USGS 01643000 |
897 cfs | 3.22 ft | · | 61°F | 231 ft | Monocacy |
|
Monocacy River At Monocacy Blvd At Frederick, Md
7 days ago · USGS 01642190 |
803 cfs | 3.16 ft | · | 61°F | 259 ft | Monocacy |
|
Big Pipe Creek At Bruceville, Md
7 days ago · USGS 01639500 |
169 cfs | 1.81 ft | · | 61°F | 370 ft | Monocacy |
|
Monocacy River At Bridgeport, Md
7 days ago · USGS 01639000 |
126 cfs | 3.41 ft | · | 61°F | 332 ft | Monocacy |
|
Piscataway Creek At Piscataway, Md
7 days ago · USGS 01653600 |
1 cfs | 2.15 ft | · | 61°F | 16 ft | Middle Potomac-Anacostia-Occoquan |
|
Nw Branch Anacostia River Near Hyattsville, Md
2 years ago · USGS 01651000 |
10 cfs | 1.18 ft | 80°F | 59°F | 21 ft | Middle Potomac-Anacostia-Occoquan |
|
North East Branch Anacostia River At Riverdale, Md
7 days ago · USGS 01649500 |
64 cfs | · | 65°F | 62°F | 14 ft | Middle Potomac-Anacostia-Occoquan |
|
Nw Branch Anacostia River Near Colesville, Md
7 days ago · USGS 01650500 |
13 cfs | 1.66 ft | · | 61°F | 271 ft | Middle Potomac-Anacostia-Occoquan |
|
St Marys River At Great Mills, Md
7 days ago · USGS 01661500 |
7 cfs | 1.46 ft | · | 64°F | 13 ft | Lower Potomac |
|
St Clement Creek Near Clements, Md
7 days ago · USGS 01661050 |
2 cfs | · | · | 62°F | 11 ft | Lower Potomac |
|
Zekiah Swamp Run Near Newtown, Md
7 days ago · USGS 01660920 |
2 cfs | · | · | 61°F | 37 ft | Lower Potomac |
|
Mattawoman Creek Near Pomonkey, Md
7 days ago · USGS 01658000 |
0 cfs | 1.93 ft | 73°F | 61°F | 46 ft | Lower Potomac |
|
Youghiogheny River Near Oakland, Md
7 days ago · USGS 03075500 |
134 cfs | 2.46 ft | · | 55°F | 2,370 ft | Youghiogheny |
|
Youghiogheny River At Friendsville, Md
7 days ago · USGS 03076500 |
343 cfs | 2.86 ft | 60°F | 60°F | 1,555 ft | Youghiogheny |
|
Bear Creek At Friendsville, Md
7 days ago · USGS 03076600 |
60 cfs | 1.93 ft | · | 60°F | 1,640 ft | Youghiogheny |
|
Casselman River At Grantsville, Md
7 days ago · USGS 03078000 |
88 cfs | 1.39 ft | · | 55°F | 2,135 ft | Youghiogheny |
By river
Explore Maryland's named rivers
Rivers across Maryland with USGS gauge coverage. Tap any one to see every gauge that reports on it -- great for paddlers, anglers, and watershed researchers narrowing in on a specific drainage.
Flow report FAQ
About Maryland streamflow
Where does the Maryland streamflow data come from?
The U.S. Geological Survey National Water Information System. USGS streamgauges report continuously (every 15 minutes) and the data is the canonical real-time record for U.S. rivers. Snoflo pulls the latest readings and joins them to a 7-day NOAA weather forecast for each station.
What is cfs?
Cubic feet per second — the standard unit for streamflow. One cfs is about 7.5 gallons per second. Small creeks run at single-digit cfs; the Mississippi at hundreds of thousands.
What does Gauge Height mean?
The water level at the gauge in feet above the reference datum. Used together with discharge to track river state. Flood stage and runnable levels are typically expressed in gauge height (e.g., "flood at 16 ft").
How fresh is the Maryland data?
USGS streamgauges report every 15 minutes; Snoflo re-pulls throughout the day. The AI briefing regenerates daily.
Can I get a flow alert for a Maryland gauge?
Yes. Save any USGS gauge as a favorite in the Snoflo iOS app, set a discharge or stage threshold (e.g. "alert me when discharge crosses 2,000 cfs"), and you'll get a push the moment it crosses.
Is this a substitute for an NWS flood warning?
No. Snoflo is informational. For flood life-safety decisions always follow guidance from your local NWS forecast office and state emergency management. Snoflo data is one input among several.
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